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Kivy Buildozer Requirements Error with Python 3

I'm trying to create an app for android using buildozer that needs to use OpenCV and therefore python 3(Due to the fact that OpenCV is only compatible with python 3+). But, when I pass buildozer -v android_new debug or buildozer android_new release or buildozer android_new debug deploy run logcat, it returns the same error:
Command failed: python -m pythonforandroid.toolchain --color=always --storage-dir=/home/kivy/KivyApp/.buildozer/android/platform/build create --dist_name=myapp21 --bootstrap=sdl2 --requirements=kivy,opencv,python3 --arch armeabi-v7a --copy-libs
The directory mentioned in the error message (/home/kivy/KivyApp/.buildozer/android/platform/build) is empty, and I believe that the reason this doesn't work is that the python version on the buildozer virtual machine is Python 2.7.13, and when the requirements stated in the buildozer.spec file are kivy, opencv, and python3, it tries to pip install them resulting in an error for the last 2.
The Buildozer.spec file:
https://docs.google.com/document/d/1UAHekPUatAOrdIU_zFRwoPWgQKd-d0L3QsRXOr2Lo4Q/edit?usp=sharing
So, in general, I wanted to fully understand the problem before trying to install a new version of python on the buildozer virtual machine. If my assumption is incorrect, please correct me and if possible, direct me to the correct answer.
Thanks!

It is not a wonder. Python3 and android and Kivy is still in experimental state.
https://kivy.org/doc/stable/guide/packaging-android.html
Better to wait or to use Python2.7

Tool unzip is missing, buildozer, kivy

I am new to kivy, and try to build an app for android using kivy.
When i was creating an apk for the app
buildozer android debug
with log_level=2
it shows:
Tool unzip is missing
Command failed: ./distribute.sh -m "kivy" -d "kivytut"
Buildozer failed to execute the last command
The error might be hidden in the log above this error
Please read the full log, and search for it before
raising an issue with buildozer itself.
In case of a bug report, please add a full log with log_level = 2
I'm unable to find any tool called upzip for buidozer(python-for-android) on the internet.
Help.

install unzip using:
sudo apt-get install unzip
moreover following are the tools that must be installed:
git
ant
python2
cython (can be installed via pip)
a Java JDK (e.g. openjdk-7)
zlib (including 32 bit)
libncurses (including 32 bit)
unzip
virtualenv (can be installed via pip)
ccache (optional)
These are several dependencies for python-for-android

Command failed: ./distribute.sh -m "kivy" -d

I am trying to follow the instructions on https://kivy.org/docs/guide/packaging-android-vm.html to create kivy android applications. I installed Kivy Buildozer VM and was following instructions on the Readme file. Created the buildozer.spec file using buildozer init command but buildozer android debug is failing with following output
(cd /media/sf_virtual_box/organizer/2nd_vid_tute/step07_padding/.buildozer/android/platform/python-for-android/build/python-install/bin; ln python2.7 python)
ln: failed to create hard link ‘python’ => ‘python2.7’: Operation not permitted
make: *** [bininstall] Error 1
Leaving ARM environment
cp: cannot stat ‘build/lib.*-2.7/_ctypes*.so’: No such file or directory
# Command failed: ./distribute.sh -m "kivy" -d "myapp1"
#
# Buildozer failed to execute the last command
# The error might be hidden in the log above this error
# Please read the full log, and search for it before
# raising an issue with buildozer itself.
# In case of a bug report, please add a full log with log_level = 2
How can I fix this?

This will occur if the kivy project on the Virtual Machine is in a shared folder with the host machine.
(In my case the host is Windows.)
If this is the case, try copying the kivy project folder to /home/, and make sure this is not shared.
Make sure the permissions are set to 777.

Command failed: tar xzf android-sdk_r20-linux.tgz

I was trying to build kivy app to android and got this error
# Check configuration tokens
# Ensure build layout
# Check configuration tokens
# Preparing build
# Check requirements for android
# Install platform
# Apache ANT found at /home/ali/.buildozer/android/platform/apache-ant-1.9.4
# Android SDK is missing, downloading
# Unpacking Android SDK
# Command failed: tar xzf android-sdk_r20-linux.tgz
#
# Buildozer failed to execute the last command
# If the error is not obvious, please raise the log_level to 2
# and retry the latest command.
# In case of a bug report, please add a full log with log_level = 2
command
$ buildozer android_new debug
log:
http://paste.ubuntu.com/20850804/
want any details? request in the comments

The machine fails to properly download the android SDK.
You can confirm this by checking the md5 sum of the file :
wget -O - http://dl.google.com/android/android-sdk_r20-linux.tgz | md5sum
This should output : 22a81cf1d4a951c62f71a8758290e9bb
If it doesn't, my first guess would be that you're blocked by some kind of proxy or firewall. A proxy can be configured to limit the maximum size of a a file you're trying to download. Check the logs or contact your sysadmins if you're not the administrator of the machine.

I figured it out!
the problem was some google services are not available where i live due to USA sanctions on my country (Sudan) and the returned response is html (not in gzip format).
the solution is to use vpn.

get error on "buildozer android debug deploy run"

get this error
Command failed: ./distribute.sh -m "kivy"
when trying to
$ buildozer android debug deploy run
How to fix it?
thanks

That means something went wrong in the python-for-android build step, but there are tons of problems that would give that error.
Could you set the buildozer token log_level = 2 in your buildozer.spec and try it again (by default it will be 1). This will get buildozer to print much more information about the build process, including hopefully more about the error. Then, could you include that error information here?